Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy control of an electric discharge device in...
Patent
1982-08-19
1985-06-18
Dixon, Harold
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy control of an electric discharge device in...
307351, 315159, 315200R, 340628, 367135, H05B 3702
Patent
active
045243042
ABSTRACT:
A portable light for emergency illumination which is activated in response to the sound emitted by a smoke alarm device. The circuit is highly simplified, making it producible in quantity, and has a performance which is highly predictable. The circuit has a very low battery drain so that it will operate from a small battery for a period of years. The circuit is highly insensitive to extraneous noise signals and utilizes the normal drop in battery voltage when the light comes on to prevent the circuit from going into an oscillation mode.
REFERENCES:
patent: 3166678 (1965-01-01), Fleshman et al.
patent: 4253164 (1981-02-01), Hall
patent: 4258291 (1981-03-01), Scott et al.
Pulse, Digital & Switching Waveforms by Millman and Taub, pp. 706, 707, 712, 713, Aug. 1967.
Dixon Harold
Gateway Scientific, Inc.
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